Please remove previous elastix image from /var/virtualizor/iso
and Add elastix iso again using iso manager. We have tested at our end it works. The iso might be not downloaded properly. Please do not close the page or go back to any other page until the iso is completely downloaded.
Also you can enable vnc option. So you can configure it manually. After installation is complete go to edit vps and change boot sequence other wise it will again boot from cd.
If you still face the issue in installation you may refer to this
http://www.virtualizor.com/wiki/Installing_Windowsor you may open a support ticket.
https://www.softaculous.net/support/